en
Scientific article
English

Lanthanide-to-Lanthanide Energy-Transfer Processes Operating in Discrete Polynuclear Complexes: Can Trivalent Europium Be Used as a Local Structural Probe?

Published inChemistry, vol. 20, no. 38, p. 12172-12182
Publication date2014
Abstract

This work, based on the synthesis and analysis of chemical compounds, describes a kinetic approach for identifying intramolecular intermetallic energy-transfer processes operating in discrete polynuclear lanthanide complexes, with a special emphasis on europium-containing entities. When all coordination sites are identical in a (supra)molecular complex, only heterometallic communications are experimentally accessible and a Tb[RIGHTWARDS ARROW]Eu energy transfer could be evidenced in [TbEu(L5)(hfac)6] (hfac=hexafluoroacetylacetonate), in which the intermetallic separation amounts to 12.6 Å. In the presence of different coordination sites, as found in the trinuclear complex [Eu3(L2)(hfac)9], homometallic communication can be induced by selective laser excitation and monitored with the help of high-resolution emission spectroscopy. The narrow and non-degenerated character of the Eu(5D0[LEFT RIGHT ARROW]7F0) transition excludes significant spectral overlap between donor and acceptor europium cations. Intramolecular energy-transfer processes in discrete polynuclear europium complexes are therefore limited to short distances, in agreement with the Fermi golden rule and with the kinetic data collected for [Eu3(L2)(hfac)9] in the solid state and in solution. Consequently, trivalent europium can be considered as a valuable local structural probe in discrete polynuclear complexes displaying intermetallic separation in the sub-nanometric domain, a useful property for probing lanthanido-polymers.

Keywords
  • Energy transfer
  • Lanthanides
  • Photophysics
  • Polynuclear complexes
  • Structural probes
Citation (ISO format)
ZAIM, Amir Hossein et al. Lanthanide-to-Lanthanide Energy-Transfer Processes Operating in Discrete Polynuclear Complexes: Can Trivalent Europium Be Used as a Local Structural Probe? In: Chemistry, 2014, vol. 20, n° 38, p. 12172–12182. doi: 10.1002/chem.201403206
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
ISSN of the journal0947-6539
600views
2downloads

Technical informations

Creation09/25/2014 3:58:00 PM
First validation09/25/2014 3:58:00 PM
Update time03/14/2023 9:48:19 PM
Status update03/14/2023 9:48:19 PM
Last indexation05/02/2024 3:35:55 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack